With the loss of Joe Calzaghe from the July 8 card, most Welsh interest at the Millennium Stadium will now centre on his new gym-mate, Enzo Maccarinelli.

The 25-year-old Swansea cruiserweight, now trained by Enzo Calzaghe following the retirement of long-time mentor Charlie Pearson, still doesn't know his opponent - or even what title he will be fighting for.

But news from Sheffield suggests that his main target, long-reigning WBO boss Johnny Nelson, is recovering well from the knee injury which scuppered a March showdown with the Welshman and could be back in the ring in September.

That could coincide with the return of Calzaghe from the damaged hand that prompted this week's pull-out and see Nelson defending against mandatory challenger Maccarinelli on the same Cardiff bill.

Given that possibility, promoter Frank Warren has to decide whether it is worthwhile digging deep to tempt Argentinian Marcelo Dominguez to Wales to contest the interim WBO title.

If not, Enzo will defend his WBU crown - and it could see a rematch with British and Commonwealth king Mark Hobson, who ran him close as a late substitute in Manchester in March. Hobson had to climb off the canvas to halt John 'Buster' Keeton in Barnsley this week, but would be fit for July, despite a slight cut.

Maccarinelli is ambivalent about the prospect.

'I've been there once,' he says. 'I've done that - even though I didn't box very well that night, I still beat him.

'But part of me wants to go out and prove I can do better against him, so I don't mind if that is what they decide.'